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n in (-oo:+oo)
(2/3)*n+1/3 = 4*n-(43/21) // - 4*n-(43/21)
(2/3)*n-(4*n)+1/3+43/21 = 0
(2/3)*n-4*n+1/3+43/21 = 0
50/21-10/3*n = 0 // - 50/21
-10/3*n = -50/21 // : -10/3
n = -50/21/(-10/3)
n = 5/7
n = 5/7
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